it was hidden from him [i.e., forgotten], therefore, it must have been known to him at the beginning; then Scripture says: and he knows of it [i.e., at the end], hence, knowledge is essential both at the beginning and at the end. If so, why does Scripture say: it was hidden from him — twice? — In order to make him liable both in the case of forgetfulness of the uncleanness, and in the case of forgetfulness of the Temple or holy food. Concerning the laws of uncleanness, then, Rabbi has his own reason; but concerning oaths, where we do not find that he gives a reason of his own, how do we know [that he holds OATHS ARE TWO, SUBDIVIDED INTO FOUR]? — It is a reasonable assumption; for, what is R. Akiba's reason for including oaths in the past tense for liability? — Because he expounds ‘amplifications and limitations’! We find that Rabbi also expounds ‘amplifications and limitations’. For it is taught: Rabbi said: The first-born of man may be redeemed by all things except bonds; but the Rabbis said: The first-born of man may be redeemed by all things except slaves, bonds, and lands. What is Rabbi's reason? — He expounds [the verse in accordance with the principle of] ‘amplifications and limitations’: And those that are to be redeemed from a month old — the verse amplifies; according to thy valuation, five shekels of silver — the verse limits; shalt thou redeem — the verse again amplifies; since it amplifies, limits, and amplifies, it includes everything, and excludes only bonds. But the Rabbis expound [the verse in accordance with the principle of] ‘generalisations and specifications’: And those that are to be redeemed from a month old — the verse generalises; according to thy valuation, five shekels of silver — the verse specifies; shalt thou redeem — the verse again generalises; since it generalises, specifies, and generalises, you must include in the ‘generalisation’ only those things which are similar to the ‘specification’: just as the specification is clearly movable and of intrinsic value, so all things which are movable and of intrinsic value [may be used for redeeming the first-born]; but you must exclude lands, which are not movable, and slaves, which have been likened to lands, and bonds, which, though they are movable, are not of intrinsic value. [Hence, since Rabbi expounds ‘amplifications and limitations’, he agrees with R. Akiba.] Rabina said to Amemar: Does Rabbi really expound ‘amplifications and limitations’? Surely, Rabbi expounds ‘generalisations and specifications’! For it is taught: [Then thou shalt take] an awl . . . Hence I deduce that an awl may be used; whence do I deduce also a sharp wooden prick, thorn, needle, borer, or stylus? — It is said: Thou shalt take — anything that may be taken by hand. This is the opinion of R. Jose, son of R. Judah. Rabbi said: and awl — just as an awl is of metal, so only those things which are of metal [may be used]. And we explained the reason for their argument thus: Rabbi expounds ‘generalisations and specifications’, and R. Jose son of R. Judah expoundsᵃᵇᶜᵈᵉᶠᵍʰⁱʲ